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diff --git a/src/drawing/mod.rs b/src/drawing/mod.rs
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+/*!
+The drawing utils for Plotter. Which handles the both low-level and high-level
+drawing.
+
+For the low-level drawing abstraction, the module defines the `DrawingBackend` trait,
+which handles low-level drawing of different shapes, such as, pixels, lines, rectangles, etc.
+
+On the top of drawing backend, one or more drawing area can be defined and different coordinate
+system can be applied to the drawing areas. And the drawing area implement the high-level drawing
+interface, which draws an element.
+
+Currently we have following backend implemented:
+
+- `BitMapBackend`: The backend that creates bitmap, this is based on `image` crate
+- `SVGBackend`: The backend that creates SVG image, based on `svg` crate.
+- `PistonBackend`: The backend that uses Piston Window for real time rendering. Disabled by default, use feature `piston` to turn on.
+- `CanvasBackend`: The backend that operates HTML5 Canvas, this is available when `Plotters` is targeting WASM.
+
+*/
+mod area;
+mod backend_impl;
+
+pub mod rasterizer;
+
+pub mod backend;
+
+pub use area::{DrawingArea, DrawingAreaErrorKind, IntoDrawingArea};
+
+pub use backend_impl::*;
+
+pub use backend::DrawingBackend;